Safety pressure device.



W. H. WALTER.

SAFETY PRESSURE DEVICE.

APPLIGATION FILED IEB.20, 1914.

1,127,128. Patented Feb. 2, 1915.

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WILLIAM H. WALTER, OF NEW YORK, N. Y.

SAFETY PRESSURE DEVICE.-

Specification of Letters Patent.

Patented Feb. 2, 1915.

Application filed February 20, 1914. Serial No. 819,972.

To all whom it may concern Be it known that I, WILLIAM H. WALTER, a citizen of the United States, and a resident'of the city of New York, borough of Manhattan, in the county and State of New York, have invented a new and Improved Safety Pressure Device, of which the following is a full, clear, and exact description. The object of the invention is to provide a new and improved safety pressure device, more especially designed for use in the flexible connection connecting a pump with a pneumatic tire for inflating the latter and arranged to prevent inflation of the tire beyond a predetermined pressure thus preventing bursting of the tire while inflating the same. In order to accomplish the desired result use is made of a safety device having a safety discharge opening leading to the atmosphere, and a frangible diaphragm normally closing the said discharge opening and tested to withstand a desired pressure.

A practical embodiment of the invention is represented in the accompanying drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a side elevation of the improved safety pressure device asapplied to the hose connection between a pump and one of the tires of a power-driven vehicle; Fig. 2 is an enlarged side elevation of the safety pressure device; Fig. 3 is a sectional side elevation of the same; Fig. 4 is a similar view of a modified form of the same; and Figs. 5

and 6 are perspective views of'diaphragms for different maximum pressures.

The body A of the safety pressure device is provided with a chamber B connected with nipples O and D preferably extending from opposite sides of the body A and screwed or otherwise detachably secured thereto. The nipple C is connected by a flexible tube E with a pump of any approved construction. As shown in Fig. 1, the pump is in the form of one of the cylinders F of a four-cylinder internal combustion engine, the said cylinder F being used at the time as a pump for pumping air with a view to inflate the tire The nipple D is connected by a hose H with the usual valve I on the tire G so that when the pump is working air is forced by way of the tube E, nipples C, D, chamber B, tube H and valve 1 into the tire G to inflate the same.

Inorder to prevent the tire from bemg lnflated with more than a predetermined pressure use is made of the following arrangement: The chamber B is provided with a discharge opening J leading into a recess K of a boss K forming partof the body A. The recess K is somewhat larger in diameter than the discharge opening J so as to form in the bottom of the recess a shoulder or a seat for a diaphragm L, made of paper or other suitable fabric material tested to withstand a desired pressure. Thus for different pressures diaphragms are used to withstand such pressures, and the diaphragms areprovided with numerals indicating the maximum pressure to which they have been tested; thus, as shown for instance in Fig. 5, the diaphragm L is tested to withstand a pressure of ninety pounds before bursting, while the diaphragm L shown in Fig. 6 is tested to withstand a pressure of forty pounds before bursting. The diaphragm L is held to its seat by a plug N screwing in the correspondingly-threaded recess K of the boss K, and the plug N is provided with a central opening N in register with the discharge opening J.

It will be noticed that in case the tire G is inflated to a pressure corresponding to or exceeding that of the diaphragm L then the latter bursts and allows the air to escape from the chamber B by way of the openings J and N thus preventing further inflation and bursting of the tire G.- It will also be noticed that the plug N can be readily screwed in place in the boss K to securely hold the diaphragm L in place with a view to close the discharge opening as long as the pressure is less than the pressure the diaphragm is capable of withstanding, as previously explained.

As shown in Figs. 1, 2 and 3, a pressure gage O is mounted on the body A and is in communication with the chamber B so that the pointer O of this pressure gage indicates the pressure in the chamber B on the usual graduation O The pressure gage O, however, may be omitted, as indicated in Fig. 4:.

It will he noticed that when the plug N is removed a diaphragm L can be readily placed in position and then secured to its seat on replacing the plug N. It will also be noted that the nipples C and D are removable and interchangeable, so that if one from said pressure chamber, and leading to the atmosphere, and a frangible diaphragm normally closing the discharge opening and tested to Withstand a predetermined pressure said diaphragm bearing thereon, a legend indicating the limit of such pressure.

2. A safety pressure device comprising a central-body member, detachable and interchangeable inlet and outlet nipples extending from said body member, a chamber in the said body member and into which leads the inlet nipple and from which leads the outlet nipple, the said chamber having a reduced outlet'opening, an apertured boss on the said body member having a threaded recess into which leads the reduced outlet opening, the said recess forming with the 7 said outlet opening a shoulder, a frangible diaphragm seated on said shoulder and tested to withstand a predetermined pressure, the diaphragm bearing a legend indicating the limit of such pressure, and a screw plug screwed in the said body and having a central opening leading to the atmosphere and inregister with the said reduced outlet opening.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WILLIAM H. WALTER.

Witnesses:

Tnno. G. Hos'rnnz PHILIP D. ROLLHAUS. 

